Tool-sharpening device.



1. F. JOY, TOOLSHARPENING DEVICE. APPLICATION FILED FEB. I2. 19H- Patentd Nov. 13, 1917.

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Patented Nov. 13, 1917.

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uivrrnn STATES PATENT onn ou.

JOSEPH FRANCIS JOY, OF COURTNEY, PENNSYLVANIA, ASSIGNOR TO THE JEFFREY MANUFACTURING COMPANY, OF COLUMBUS, OHIO, A CORPORATION OF OHIO.

TOOL-SHABPENING DEV ICE.

Specification of Letters Patent.

Patented Nov. 13, 1917.

Application filed February 12, 1914. Serial No. 818,322.

To all whom it may concern:

Be it known that I, JOSEPH F. JOY, a citizen of the United States, residing at Courtney, in the county of YVashington and State of Pennsylvania, have invented certain new and useful Improvements in Tool-Sharpening Devices, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to a portable implement adapted to'be carried from point to pointin a coal mine'and used for sharpening the coal cutting bits with which kerf cutting mining machines are provided.

According to present practice when the bits of a mining machine have to be resharpened they must be first removed from the machine and then transported aconsiderable distance to a blacksmith shop to be redressed. Much time is lost in transit and in the blacksmith work with the result that the mining machine is frequently l ept out of service or operated at low etliciency because of the shortage of suitable bits. By my invention I provide a simple implement adapted to be used in the mine adjacent the.

machine to sharpen the bits as required. The

device can be used by the machine operators helper during the time when he would otherwise be. unoccupied.

The object therefore of my invention is to provide a portable bit sharpening device adapted for use in the way above described. Further objects of the invention are to provide in a portable implement of this character various improved features and arrange ments of parts which will be fully apparent from the following specification.

Referring to the drawings Figure 1 is an end view.

Fig. 2 is a fragmentary plan view showing the central part. i

Fig. 8 is a side view partly in elevation and partly in section along the line 33 of Fig. 1.

Fig. 4 is a perspective view of one of the bits in connection with which the mechanism is used.

Fig. 5 is a fragmentary sectional view taken along the line 55 of Fig. '6.

Fig. 6 is a fragmentary sectional view taken along the line 6-'6 of Fig. 1.

Referring to the drawings, 1 represents,

as an entirety, the supporting structure which is formed of cast iron or steel and is shaped to provide an upright or post element and a laterally expanded base structure by which the upright and the parts mounted thereon can be firmlyand rigidly supported on the ground, the parts constituting the base structure and the upright being cast integrally together. I so shape the base structure that it will have upwardly extended, integral, metallic walls extending laterally to a considerable distance from the standard or upright i, the upwardly extending walls increasing the weight of the base and enhancing the firmness with which the operative parts of the devices (to be described) are held in position, and these walls, also, providing open chambers adapted to contain the materials required for heating and treating'the mining machine bits which are gripped to the standard at the times when they are being shaped, dressed and sharpened. The details of structure and arrangement of the standard and the parts thereon and of the base structure and its adjuncts are as follows:

Positioned in the reservoir or compartment 2 is a lining 5 of suitable insulating material, such as earthen ware, which covers the bottom, two sides and the outer end of the compartment. 6 is an electric contact plate or electrode positioned at the outer end of the compartment 2 and connected with a feed wire 7 by means of the shank 8 which extends through the wall of the compartment and the wall of the lining and is insulated from the compartment wall by means of the bushing 9 and the washer '10. A second feed wire 11 similar to the wire 7 is connected directly to the frame 1 at any suitable point and serves to ground it. The reservoir or compartment 2 is partly filled with screened crushed carbon. It will be seen that when the wires 7 and 11 are connected with a suitable source of current supply t-he current will pass through the crushed carbon in the compartment 2 which because of its high resistance will become highly heated. A bit to be sharpened is first brought to the required temperature by be ing thrust into this body of crushed carbon, as shown at 12 in Fig. 1. and allowed to remain for a short period of time.

The standard 4 is provided at its upperand with an enlargement or head 13 in which there is formed an inclined socket 1 lshaped to receive the shank of the heated bit 12". Loosely mounted on a transverse shaft 15 extending through the head 13 is a bifurcated lever 16 having a handle 17. The lever 16 is provided with ears 18 carrying a transverse shaft or pin 19 upon which is mounted a forming roller 20. Mounted in a. suitable socket 21 in the head 13 is a cut oil bar of self hardening steel 22. At the lower end of the socket 21 is a threaded aperture. for receiving a bolt 23. By adjusting this bolt 23 the steel bar 22 can be moved upward or downward to vary the position of its upper end.

The upper surface of the head 13 is curved A concentrically with the axis of the pivot shaft 15, and the roller 20 when moved follows closely this curved upper surface. When a properly heated bit' is inserted in the socket let the lever 16 can be moved downward to press the roller 20 against the upper and outer part of the bit to force it over against the steel bar 22 by means of which any excess metal is cut off leaving a sharp cutting edge.

It will be seen that the length and shape of the .bit after treatment depends entirely upon the depth to which the shank of the bit is permitted to descend into the socket 14:. Ohviously when a set of bits is re-sharpcned peatedly the bits will become successively shortened and must be inserted into the socket to successively decreasing depths. In order to provide an adjustable abutment for the'shanks of the bits I make use the bar 24- which proiects into the socket from the lower end. This bar 24- carries at its lower end the cross head 25 which is connected by means of links 26, 26with arms 27, 27 keyed to the aforesaid shaft 15. The shaft 15 also carries an arm 28, preferably integral with one of the arms 27, which carries a manually controllable latch or detent 29 adapted to v engage one of the notches in the segment 30. Obviously the operator by releasing the latch 29 and moving the arm 28 can raise or lower the bar 91} to adjust the mechanism for bits of difi'erent lengths. After adjustment the bar is automatically locked in position by the engagement of the detent with one of the notches. sharpened it can be raised in the socket and partly ejected by means'of this same mecha nism comprising the bar 24 and the arm 28.

After the bit has been raised and removed the arm .28 is returned to bring the latch back into the notch which is suitable for bits of the sort being sharpened.

After a bit has been sharpened it is plunged into a suitable tempering bath in the compartment or reservoir 3. This tempering bat-h can be water or any of the tempering substances-or compounds which are.

Qoples 01 this patent may be obtained for five cents each. by addressing the commissioner of Patents,

After the bit has been formed and ipeep'eo now well known adapted for work of this general character.

I have thus described, in detail, how an implement of this character for the treatment of mining machine bits in the cramped and restricted rooms of coal mines can be made and the uses to which it can be put. But it will be seen that there can be various modifications in the details provided the operative is furnished with a portable structure comprising the upright or standard for supporting the bit gripping and retaining devices in proper position and supporting the power devices which effect the compressing, bending and shaping of the metal, together with a widely expanded heavy base structure rigidly secured to. preferably cast with, the standard or upright, and adapted to hold the operative parts firmly in position without requiring the use of stakes or spikes driven into the ground to hold the standard.

"What I claim as new is:

1. T he herein-described implement for the treatment of mining machine cutter hits, it having a cutter-bit gripping and retaining device, power actuated devices for exerting pressure on the bit while heated and held in the retainer, and a metallic support having an upright on which are permanently 1nounted said power devices and bit retainer and having a laterally extended metallic base structure cast integrally with the upright and arranged to provide it with a horizontally extended heavy ground support, said base structure being cast with integral upwardly extended heavy metallic walls to increase the weight and assist in holding the power devices and bit retainer in proper po' sition.

2. The herein-described portable imple ment for the treatment of mining machine cutter hits, it having cutter-bit gripping and retaining device, power actuated devices for exerting pressure on the bit while heated and held in the holder, at supporting stand-- ard for permanently mounting the said power devices and bit retainer, and a hort zontally extended base structure rigidly con nected to the standard to hold it with a wide support firmly on the ground, said base structure being cast with integral upwardly extended metallic walls adapted to assist in holding the upright and the power devices in operative position, and also to hold masses of materials used in treating the cutter bits that have been operated on in the retaining device.

In testimony whereof, I affix my signature, in presence of two witnesses.

JOSEPH FRANCIS JOY. Witnesses:

0. S. BROWN, W'ILLIAM Lormm-ax.

Washington, D. G. 

